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Proceedings of the Seventh Guiana Geological Conference, November 1966, Paramaribo.
1969 175 p., num. figs & photographs, paperbound + 19 enclosures including one large folded col. map in separate slip case. Published in: Verhandelingen Koninklijk Nederlands geologisch-Mijnbouwkundig Genootschap.
Proceedings of the Seventh Guiana Geological Conference, 1966, Paramaribo.
1969 175 p., num. figs & tables, maps in separate slipcase.
Four palynological contributions. 1: Upper Pleistocene and Holocene climate and vegetation of the Sabana de Bogota (Colombia, South America). 2: A palynological study on the Quaternary of British Guiana. 3: A palynological study on the Tertiary and Upper Cretaceous of British Guiana. 4: Palynological data on the history of tropical savannas in northern South America.
1960-1966 180 p., num. figs, wrps (reprints from Leidse Geol. Meded.).
Palynology.
1974 159 p., paperbound. Vol. 53#6 of Geologie en Mijnbouw, completely devoted to Prequaternary, Pleistocene, Holocene palaeobotany. Contains 12 papers.
